Use dedicated DISABLED() function to disable tests in Python test framework #281

Job	Run time
Basic build	2m 7s
Source checkers	45s
Ubuntu / Linux (N=1 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=debug)	21m 36s
Ubuntu / Linux (N=2 OS=ubuntu OS_VER=22.04 FAULT_INJECTION=1 TEST_BUILD=nondebug UBSAN=1)	20m 15s
Ubuntu / Linux (N=3 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=debug)	25m 52s
Ubuntu / Linux (N=4 OS=ubuntu OS_VER=22.04 PMDK_CC=clang PMDK_CXX=clang++ TEST_BUILD=nondebug AUTO_DOC_UPD...	18m 46s
Ubuntu / Linux (N=5 OS=ubuntu OS_VER=22.04 COVERAGE=1 FAULT_INJECTION=1 TEST_BUILD=debug)	15m 32s
CentOS / CentOS (OS_VER=7 FAULT_INJECTION=1 TEST_BUILD=debug)	18m 50s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug)	14m 33s
CentOS / CentOS (OS_VER=7 TEST_BUILD=debug NDCTL_ENABLE=n)	17m 13s
CentOS / CentOS (OS_VER=7 TEST_BUILD=nondebug NDCTL_ENABLE=n)	14m 13s
CentOS / CentOS (OS_VER=stream TEST_BUILD=debug)	20m 41s
CentOS / CentOS (OS_VER=stream FAULT_INJECTION=1 TEST_BUILD=debug)	23m 53s
CentOS / CentOS (OS_VER=stream TEST_BUILD=nondebug)	15m 51s
	3h 50m 7s

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